When I try to send email I get this message: "The sent items folder is unavailable. This message began appearing after he copied and pasted all of my Outlook data files. (which caused another problem. The files were duplicated, and the one file which has the complete content is now not connected to the other subfolders. However, there's an incomplete set of data which does contain the right folders. I am not sure if the root cause of these two problems is the same, nor how to fix them.